DNA replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules.
The heart pumps oxygenated blood to the body and deoxygenated blood to the lungs. In the human heart there is one atrium and one ventricle for each circulation, and with both a systemic and a pulmonary circulation there are four chambers in total: left atrium, left ventricle, right atrium and right ventricle.
The cardiovascular system. The movement of blood around the body, pumped by the heart, is called circulation. Your heart, blood and blood vessels together make up your cardiovascular system (or heart and circulatory system).Your body contains about five litres (eight pints) of blood, which your heart is continuously circulating.our heart, blood and blood vessels together make up your cardiovascular system (or heart and circulatory system). Your body contains about five litres (eight pints) of blood, which your heart is continuously circulating.